Chilled-roll alloy



Patented Apr. 2, 1929. I

ruTEn s'rA Es FIRANK D. TAGGART, OF YOUNGSTOWN, OHIO.

GRILLED-ROLL ALLOY.

No Drawing.

My invention relates to an improved alloy metal adapted particularly forthe manufacture of chilled rolls used in shaping metal bars and plates.

Such alloys commonly consist mainly of iron, in combination with otherelements in determined proportions, where-by desired characteristics areimparted; and my invention relates more specifically to an improvedalloy in which 'a content .of vanadium is employed, in connection withcarbon and chromium particularly as'hereinafter fully described, so asto most satisfactorily produce effects desired in a roll'having achilled surface or primary structure'with a blended se ondary structure;it being noted that the elements mentioned have heretofore beendifferently employed by me in a roll alloy of different character as setforth in Carbon Chromium Vanadium; Silicon Manganese between .20 percent and .70 per cent; the

50 percentage of the minor element sulphur. being between .04 and .08per cent,-and of phosphorus between .02 and .05 per cent.

The vanadium element as employed in this alloy in connection with thecarbon and 55 chromium content, is conserved without oxidation orscavenger action, so as to effect Application filed July 16,

1927. Serial No. 206,379,

Patent No. 1,213,973 issued to me Jan. 30, 20.

The essential feature of my present alloy" is the provision of arelatively high carbon content in connection with main alloy elementschromium and vanadium, and second ary elements silicon and manganese,ashereinafter specifically set forth; tninor elements sulphur andphosphorus being present as ordinarily occurs-without substantial effecton the desired characteristics imparted. I have found by various trials,that the proportions of these stated elements may be varied withinlimits without materially departing from the essential characteristicsdesired in my improved alloy, but state the following approximatepercentages as most satisfactorily embodying my invention, as nowdetermined, to wit:

. v Per cent. about 3.00 about 1.75 about .20 about 1.00 "about" .50

its essential functioning economically notwithstanding it is anexpensive element, by

notably increasing the depth and homogeneity of the chilled primaryandsecondary structure of the roll, with toughening and avoidance ofcracks, aswell as insurance of ample strength to withstand the strains,and hardness to withstand the wear, incident to service.

What I claim is:

A chilled-roll alloy made up of approximately, 3.5 per cent of carbon,1.75 per cent of chromium, .20 per cent of vanadium,

1.00 per cent of silicon, and .50 per cent of manganese, with minorcontent of sulphur and phosphorus. In testimonywhereof I aflix mysignature.

FRANK D. TAGGART.

